micromillimetre /mī-krə-milˈi-mē-tər/

1. One millionth of a millimetre (now nanˈomētre; obsolete)
2. One thousandth of a millimetre (non-standard)

• optician
• opticians
• optic lobe
• optic lobes
• optic nerve
• optic nerves
• optics
• optic thalamus
• optic tube
• optima
• optimal
• platen
• platens
• plate-powder
• plate-printing
• plate-proof
• plate-proofs
• plater
• plate rack
• plate racks
• plate rail
• plate rails
• plateresque
• plate-room
• plate-rooms